:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary: #f97316;
    --secondary-dark: #ea580c;
    --accent: #06b6d4;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --gray-900: #111827;
    --gray-800: #1f2937;
    --gray-700: #374151;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --gray-50: #f9fafb;
    --white: #ffffff;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-50);
    -webkit-font-smoothing: antialiased;
}

.page-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

/* HEADER */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--white);
    box-shadow: var(--shadow);
}

.header-top {
    background: var(--dark);
    color: var(--white);
    padding: 8px 0;
    font-size: 13px;
}

.header-top-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-contacts {
    display: flex;
    align-items: center;
    gap: 20px;
}

.header-phone {
    color: var(--white);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
}

.header-phone:hover {
    color: var(--primary-light);
}

.header-address {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--gray-400);
}

.header-actions {
    display: flex;
    gap: 16px;
}

.header-link {
    color: var(--gray-400);
}

.header-link:hover {
    color: var(--white);
}

.header-main {
    padding: 16px 0;
}

.header-main-inner {
    display: flex;
    align-items: center;
    gap: 32px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 20px;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-name {
    font-size: 20px;
    font-weight: 800;
    color: var(--dark);
    line-height: 1.2;
}

.logo-domain {
    font-size: 12px;
    color: var(--gray-500);
}

.nav {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 14px;
    color: var(--gray-700);
}

.nav-link:hover {
    background: var(--gray-100);
    color: var(--primary);
}

.header-search {
    flex: 1;
    max-width: 300px;
}

.search-form {
    display: flex;
    background: var(--gray-100);
    border-radius: var(--radius);
    overflow: hidden;
    border: 2px solid transparent;
    transition: var(--transition);
}

.search-form:focus-within {
    border-color: var(--primary);
    background: var(--white);
}

.search-input {
    flex: 1;
    padding: 10px 16px;
    border: none;
    background: transparent;
    font-size: 14px;
    outline: none;
    font-family: inherit;
}

.search-btn {
    padding: 10px 16px;
    background: transparent;
    border: none;
    color: var(--gray-500);
    cursor: pointer;
    transition: var(--transition);
}

.search-btn:hover {
    color: var(--primary);
}

.burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.burger span {
    width: 24px;
    height: 2px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 14px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    text-align: center;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.btn-full {
    width: 100%;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px -5px rgba(37, 99, 235, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-white {
    background: var(--white);
    color: var(--primary);
    border-color: var(--white);
}

.btn-white:hover {
    background: var(--gray-100);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* HERO */
.hero {
    position: relative;
    padding: 100px 0;
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-light) 50%, #1a365d 100%);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><radialGradient id="g" cx="50%" cy="50%"><stop offset="0%" stop-color="%232563eb" stop-opacity="0.15"/><stop offset="100%" stop-color="transparent"/></radialGradient></defs><circle cx="200" cy="200" r="300" fill="url(%23g)"/><circle cx="800" cy="600" r="400" fill="url(%23g)"/></svg>');
    background-size: cover;
}

.hero-particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
}

.hero-title {
    font-size: 52px;
    font-weight: 900;
    color: var(--white);
    line-height: 1.1;
    margin-bottom: 20px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--gray-400);
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* ADVANTAGES */
.advantages {
    padding: 60px 0;
    margin-top: -40px;
    position: relative;
    z-index: 2;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.advantage-card {
    background: var(--white);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.advantage-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.advantage-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 24px;
}

.advantage-card h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--dark);
}

.advantage-card p {
    font-size: 14px;
    color: var(--gray-500);
}

/* SECTIONS */
.section-header {
    text-align: center;
    margin-bottom: 48px;
    position: relative;
}

.section-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--gray-500);
}

.section-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    font-weight: 600;
    margin-top: 12px;
}

.section-link:hover {
    gap: 12px;
}

/* CATEGORIES */
.categories-section {
    padding: 80px 0;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.category-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    height: 200px;
    display: block;
    transition: var(--transition);
}

.category-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.category-image {
    position: absolute;
    inset: 0;
}

.category-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.category-card:hover .category-image img {
    transform: scale(1.1);
}

.category-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.3));
}

.category-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px;
    color: var(--white);
    z-index: 1;
}

.category-info h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 4px;
}

.category-count {
    font-size: 13px;
    color: var(--gray-400);
}

/* PRODUCTS */
.featured-section,
.related-section {
    padding: 80px 0;
    background: var(--white);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.products-grid-catalog {
    grid-template-columns: repeat(3, 1fr);
}

.product-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.products-grid .product-card {
    background: var(--gray-50);
}

.featured-section .product-card,
.related-section .product-card {
    background: var(--white);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.product-image {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
    background: var(--gray-100);
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.product-card:hover .product-image img {
    transform: scale(1.08);
}

.product-badge {
    position: absolute;
    top: 12px;
    left: 12px;
}

.badge-discount {
    background: var(--danger);
    color: var(--white);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
}

.product-info {
    padding: 16px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.product-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 12px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-price-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: auto;
    margin-bottom: 12px;
}

.product-price {
    font-size: 18px;
    font-weight: 800;
    color: var(--dark);
}

.product-old-price {
    font-size: 14px;
    color: var(--gray-400);
    text-decoration: line-through;
}

.product-action {
    text-align: center;
}

/* CTA */
.cta-section {
    padding: 80px 0;
}

.cta-card {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius-lg);
    padding: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    position: relative;
    overflow: hidden;
}

.cta-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: rgba(255,255,255,0.05);
    border-radius: 50%;
}

.cta-content h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 12px;
}

.cta-content p {
    font-size: 16px;
    color: rgba(255,255,255,0.8);
}

/* PAGE HEADER */
.page-header {
    padding: 48px 0 32px;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
}

.page-header-sm {
    padding: 24px 0 16px;
}

.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--gray-500);
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.breadcrumbs a {
    color: var(--primary);
}

.breadcrumbs a:hover {
    text-decoration: underline;
}

.page-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 8px;
}

.page-subtitle {
    font-size: 16px;
    color: var(--gray-500);
}

/* CATALOG */
.catalog-section {
    padding: 40px 0 80px;
}

.catalog-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 32px;
}

.catalog-sidebar {
    position: sticky;
    top: 120px;
    align-self: start;
}

.sidebar-block {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.sidebar-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 16px;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--gray-700);
    transition: var(--transition);
}

.sidebar-link:hover {
    background: var(--gray-100);
    color: var(--primary);
}

.sidebar-link.active {
    background: var(--primary);
    color: var(--white);
}

.sidebar-link i {
    width: 20px;
    text-align: center;
    font-size: 14px;
}

.sidebar-count {
    margin-left: auto;
    font-size: 12px;
    background: var(--gray-100);
    padding: 2px 8px;
    border-radius: 10px;
    color: var(--gray-600);
}

.sidebar-link.active .sidebar-count {
    background: rgba(255,255,255,0.2);
    color: var(--white);
}

.sidebar-contacts {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sidebar-contact {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--gray-700);
}

.sidebar-contact i {
    color: var(--primary);
    width: 20px;
    text-align: center;
}

/* PRODUCT DETAIL */
.product-section {
    padding: 40px 0 80px;
}

.product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.product-gallery {
    position: sticky;
    top: 120px;
    align-self: start;
}

.product-main-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--white);
    box-shadow: var(--shadow-lg);
}

.product-main-image img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
}

.product-badge-lg {
    position: absolute;
    top: 16px;
    left: 16px;
}

.product-badge-lg .badge-discount {
    font-size: 14px;
    padding: 6px 14px;
}

.product-detail-name {
    font-size: 32px;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 16px;
    line-height: 1.2;
}

.product-detail-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.product-detail-category,
.product-detail-sku {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--gray-500);
}

.product-detail-price-block {
    background: var(--gray-50);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 24px;
}

.product-detail-price {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.price-current {
    font-size: 36px;
    font-weight: 900;
    color: var(--dark);
}

.price-old {
    font-size: 18px;
    color: var(--gray-400);
    text-decoration: line-through;
}

.price-save {
    font-size: 14px;
    color: var(--success);
    font-weight: 600;
}

.product-detail-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 32px;
}

.product-detail-features {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px;
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.feature-item i {
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: var(--white);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

.feature-item strong {
    display: block;
    font-size: 14px;
    color: var(--dark);
}

.feature-item span {
    font-size: 13px;
    color: var(--gray-500);
}

.product-description {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow);
}

.description-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 20px;
}

.description-content {
    font-size: 15px;
    line-height: 1.8;
    color: var(--gray-700);
}

/* FOOTER */
.footer {
    background: var(--dark);
    color: var(--gray-400);
    padding: 60px 0 24px;
    margin-top: auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo .logo-name {
    color: var(--white);
}

.footer-desc {
    font-size: 14px;
    line-height: 1.7;
}

.footer-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.footer-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-list a {
    font-size: 14px;
    color: var(--gray-400);
}

.footer-list a:hover {
    color: var(--white);
}

.footer-contacts {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-contact {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
}

.footer-contact i {
    color: var(--primary-light);
    width: 20px;
    text-align: center;
}

.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
}

/* EMPTY STATE */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 80px 20px;
}

.empty-state i {
    font-size: 48px;
    color: var(--gray-300);
    margin-bottom: 16px;
}

.empty-state h3 {
    font-size: 20px;
    color: var(--dark);
    margin-bottom: 8px;
}

.empty-state p {
    color: var(--gray-500);
    margin-bottom: 24px;
}

/* ANIMATIONS */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.animate-fade-up {
    animation: fadeUp 0.6s ease forwards;
    animation-delay: var(--delay, 0s);
    opacity: 0;
}

.animate-fade-left {
    animation: fadeLeft 0.6s ease forwards;
    animation-delay: var(--delay, 0s);
    opacity: 0;
}

/* RESPONSIVE */
@media (max-width: 1024px) {
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .products-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .products-grid-catalog {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .catalog-layout {
        grid-template-columns: 1fr;
    }
    
    .catalog-sidebar {
        position: static;
    }
    
    .product-detail {
        grid-template-columns: 1fr;
    }
    
    .product-gallery {
        position: static;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header-top {
        display: none;
    }
    
    .nav {
        display: none;
    }
    
    .burger {
        display: flex;
    }
    
    .header-search {
        display: none;
    }
    
    .hero {
        padding: 60px 0;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .products-grid,
    .products-grid-catalog {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .cta-card {
        flex-direction: column;
        text-align: center;
        padding: 40px 24px;
    }
    
    .cta-content h2 {
        font-size: 24px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .product-detail-name {
        font-size: 24px;
    }
    
    .price-current {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    .products-grid,
    .products-grid-catalog {
        grid-template-columns: 1fr;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .hero-actions .btn {
        width: 100%;
    }
}